As technology advances, buildings are becoming taller and more diverse in shape. In general structures, unequal deflection of vertical members inevitably occurs due to differences in axial stiffness and tributary area.

However, in the case of high-rise buildings, if unequal deflection of vertical members is not considered during the construction sequence, serviceability problems such as curtain wall performance, floor horizontality, and additional stress on the pipeline may occur. Not only these but also structural safety problems may occur due to additional stress on horizontal members.

There are two cases of axial shortening. One is elastic shortening and the other is inelastic shortening due to creep and shrinkage. Steel vertical members are only subject to elastic shortening. However, reinforced concrete members are subject to elastic and inelastic shortening due to material properties such as creep and shrinkage.

Therefore, it is essential to accurately predict differential shortening which is the relative displacement between the vertical elements, especially in tall buildings.

midas Gen's construction stage analysis function considering time-dependent material properties(Creep & Shrinkage) was developed to analyze the construction process of high-rise buildings to solve the problems described above.

Therefore, the elastic deflection of vertical members as well as inelastic deflection due to creep and shrinkage can be calculated with input variables such as concrete strength, construction period, pouring conditions, and climatic conditions, and the amount of unequal shortening between members can be checked.

At this webinar, we will demonstrate the construction stage analysis considering the time-dependent material properties(Creep & Shrinkage) of concrete and how to check the unequal shortening between vertical members.